Hi Does it really matter if you put in 87 octane or 88 or 89?

What;s the difference really? Also does it dammage the car to put in 87?

Thanks

 

Doesn't the engine "throttle" back? (I dunno the correct term) You can do it but I wouldn't recommend it. If you can't afford the $5 extra dollars per tank you shouldn't have a G.

 

Yeah, it matters in a BIG way!

The lower the octane is, the easier the gas detonates (explodes before the spark plug fires).

High compression engines like the VQ35 really squeeze the air/gas mixture in the cylinder. Whenever a gas is squeezed, the temperature increases. Add that to a hot engine and the stage is set for detonation.

If detonation occurs, the explosion may force the rods directly towards the crankshaft or even try to turn the crankshaft in the wrong direction. If this occurs, chances are that you will hear a loud bang followed by noticing a stream of oil and a curious selection of parts on the road in your rearview mirror. It can only take a split second as plenty of guys have already testified!

The ECU responds to the onset of pinging and pulls timing, but it can't stop full blown detonation. In the "best case scenario" you will lose a lot of power as the ECU tries to preserve the engine's integrity.

All knowledgeable G35 drivers intentionally search for the highest octane thay can find.

 

Hell yeah exactly what exagorazo said. That is exactly right. the more tuned your engine is, the easier it is for lesser octane gas to detonate prematurly. and we all know that premature detonation is bad in a number of ways. So word to the wise, dont do it in your car or in the bedroom, and all will be fine.

 

well said...exagorazo

they should sticky this thread cus this subject matter comes up every couple of months

 

dumb question, Could a dealer void your warranty if u had detonation from using regalar gas?

 

Nice explanation exagorazo.

kleicoupe, I suppose they could if there was major engine damage they could prove was caused by regular use of an inferior grade of gas. Why, you having problems?

 

where do you live that only offers 89 as the highest octane?

well my dealer suggested i put in the lowest octane (87) because its cheaper..then i read in the manual that if youre on empty you can use 87 but dont fill it up all the way..just as much as you need..then fill her back up with premium

i have trust issues and i tend to think the dealer advised me (off record) to use 87 so it will **** up my car so id have to take it in for servicing..so they make $$

i dont know..id stick with premium..if you buy a g you gotta treat her right..if you wanna economical car buy a toyota..i hear they last forever lol (that wasnt sarcastic..my toyota corolla really did!)

 

How often do you fill up? If it's every other day, I might be able to see the justification (for some, not me). At a $.10/gallon difference, that's $1.60 a tank. If it's a weekly thing, then the difference is only around $80/year.

Our highest available has been 91 for a good while now. If I could still find 93, I'd be willing to pay another $.10/gallon for it.

91 Supreme at a local Chevron is currently $2.83.

 

Man, tis cheap down there in Texas. Chev 92 is $3.39 up here in WA

 

Quit your whining... its $1.16 per litre here in Canada. Thats $5.00 per gallon to you. I would love to see 3.39!

 

$3.35-3.45 here

 

Yeah, I know. That's why all the Vancouver folks come down and fill up after spending their strong loonies at the outlet stores. About the only thing I buy in Canada now is the bud. Still the best for my $.